The Pinnacles Desert, located in Nambung National Park in Western Australia, is renowned for its striking limestone formations that rise from the yellow sands. These eerie spires, some of which stand up to 4 meters tall, have fascinated geologists and visitors alike for their unique structure and the surreal landscape they create. But how exactly did these ancient limestone pillars come to be? Here’s a closer look at the geology of the Pinnacles and how these remarkable formations were created over thousands of years.What Are the Pinnacles?The Pinnacles are ancient limestone pillars formed from the remnants of marine life that lived in the region millions of years ago. Composed mostly of calcium carbonate (the main component of limestone), the Pinnacles were formed by a combination of geological, chemical, and biological processes over tens of thousands of years. These spires are a testament to the power of natural forces, including the influence of wind, water, and plant roots.The surrounding desert sand consists largely of quartz grains, which provide a stark contrast to the pale limestone of the Pinnacles, making the formations stand out dramatically in the landscape.Image © Tourism Western AustraliaTimeline of the Formation of the PinnaclesThe formation of the Pinnacles is a slow process that began millions of years ago when the area that is now Nambung National Park was covered by the sea. Here’s an overview of the timeline of their formation: